HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
gonzo

YZ400 Hotter Plug

7 posts in this topic

I was wondering if anyone could tell me a hotter plug that I could use for the YZ400. Stock is a CR8E.

Thanks,

Alex

Share this post


Link to post
Share on other sites

I hope no one does. 8's are hot enough. An EK may not foul as easily. Some prefer the Iridium plugs. But don't go hotter.

mwc

Share this post


Link to post
Share on other sites

I agree with mark, i don't know if it hurts to use a hotter plug but If you want to there is a cr7e. Try the cr8ek, it works good and doesnt foul near as easily.

__________________________________________________

98 yz400

[ May 21, 2002: Message edited by: strack ]

Share this post


Link to post
Share on other sites

Strack,

I got some bad gas Monday. Ego will comment on that in a minute. Anyway, Monday evening I went through two plugs (CR8Es). They fouled black but different than rich fouling. Looked like flat enamel black.

I picked up a box of CR8Es before going riding last night (upcoming group ride). While I was there, I got a EK and EIX(?), just for grins. The new CR8E lasted about three laps (1.6 mile laps), the first one was an observation lap. Then I put in the heavy iron, the CR8EIX(?). It lasted probably 5 laps. Then I put on the EK. I ran hard about 2 1/2 hours (ran through the rest of the tank of gas, at least down to reserver, that's a lot of riding) and it's still in there.

I am overlean just to prove a point. 162 main, 35 pilot, FHN#3. The fouling was not rich.

In fairness, mostly on the EK, I was cutting the lower part of the track where I was harder on the gas (practicing changing attitude in air over a big but safe tabletop). That may have been the determining factor. But 8E, 3 laps. EIX 5 laps. EK energizer bunny.

Good luck,

mwc

Share this post


Link to post
Share on other sites

Somone Say "BAD GAS" :D

Unless ya want to burn a hole in your piston you should not place a hotter plug into the bike....

Long term this will damage and eventually burn a hole in the piston (IF YOUR JETTING IS TO LEAN).

Again, I dont understand why I see so many people with plugs just giving up the ghost. I have had two plugs in my 00 Since I have owned it in Jan of 02. I replaced the first becouse I just wanted to no reason. Now that plug is in my sons 02 250f running fine...

I think the suggestion of "BAD GAS :D " may be valid, I have never gotten BAD GAS, Well Except when I eat at That TacoRia before I ride :)

Thanks Mark for starting me up :D

Share this post


Link to post
Share on other sites

Gonzo,

A hotter plug (CR7E)is an effective option for combating plug fouling and will work well if you're riding in conditions that don't allow sustained wide-open throttle: woods, trails, tight mx tracks. I have run a "7" extensively with no problems.

WARNING: If you opt for the hotter plug and take your bike to the desert, flat track racing, or long fire roads--any place where you can keep it pinned in 5th--you risk melting a piston. This happens when the high combustion temps turn the CR7E into a "glow plug" which initiates destructive detonation/preignition.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0